Apparatus for turning bolts, screws, &amp;c.



G. X. WITTMER.

APPARATUS FOR TURNING BOLTS, SCREWS, 6w.

APPLICATION FILED MAR. 13, 1908.

Patented Apr. 20, 1909.

GEORGE X. WITTMER, OF PITTSBURG, PENNSYLVANIA.

APPARATUS FOR TURNING BOLTS, SCREWS, &c.

no, elapse.

Specification of Letters Patent.

Patented April 20, 1909.

Application filed March 13, 1908. Serial No. 420,818.

To all whom it may concern:

Be it known that I, GEORGE X. WITTMER, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented certain new and usefu-Im rovements in Apparatus for Turning Bolts, crews, &c., of which thefollowing is a specification.

An ob ect of my invention is to provide an apparatus for turningthreaded-bolts, screws, or other threaded parts; also, for turning nutsor bolts and for similar purposes.

A further object of my invention is to provide an apparatus to be usedfor the above specified" and other similar purposes, of suchconstruction, that the rota or turning movement imparted to the b0 t,screw, nut,

-or other object, will be automatically freed from the driving action ofthe motor-and stopped-when a predetermined resistance or pressure isencountered. By roviding means for automatically stopping t 1e rotarymovement of the object being turned upon encountering a certainresistance, I eliminate the danger of forcing the head off the bolt orinjuring the threaded portion of the part or object being turned intothe desired osition,

In the accompanying drawing, whi ch illustratesthc preferred embodimentof my in .vention, Figure 1 is a part side elevational anda partvertical sectional view of an apparatus constructed in accordance withmy in vention; ig. 2 an end elevational view of a portion of theapparatus; and l ig. 3 a detail view particularly showing thedifferential gearing employed.

Referring to the drawing, 1. designates an electric-motor, and 2 aflexible rotary shaft inclosed in a suitable casing 3. interposedbetween the motor and the fiexible'shaft, I employ a difierential gearmechanism 4- mounted in a housing 5. As illustrated, the motor-shaft 6is connected withn shaft 7 of the gear mechanism by means of acouplingmember 8, and the flexible-shaft with a second gear-shaft 9,which latter is in axial alinement with gear-shaft 7. Secured to theouter end of the flexible rotary shaft casing 1 cm loy handle 10 and asuitable holder 11.

t is obvious that in place of an electricmotor another form of motor mabe employed in connection with the dlfl'erential gear mechanism and alsothat instead of connecting the holder to a flexible shaft, it may besecured to and operated bya non-flexible rotary shaft. I

An important part of the apparatus shown for effecting the turning ofthe threaded part and the stoppage thereof, when a predeterminedresistance or pressure is encountered, is the differential gearmechanism. This mechanism, in addition to the alined shafts T and 9above referred to, comprises, a casing or hollow-member which preferablyconsists of two parts 12 and 13 secured together by bolts 14 and thegearing proper. The casing is mounted in the housing and is adapted torevolve therein as hereinafter described. The gearing proper consists,of a small drive gear-wheel 15 carried on and adapted to revolve withshaft 7, a larger driven gearwheel 16 mounted on gear-shaft 9, and twosets of gears each respectively loosely mounted on spindles 17 and 18which latter are supported by the casing. The gears carried upon spindle17 and which are arranged to revolve together comprise a largegear--wheel 19 and a smallgear 20. The diameter of wheel 19 correspondswith the diameter of wheel 16, and the diameter of gear-wheel 20 withthat of the drive gear-wheel 15. The gears on spindle 18, which are alsodesigned to revolve together and are loosely mounted on said spindle,comprise a small gear 21, and a large gear 22. The size of the smallgear 21 is the same as the other small gears 15 and 20, and the diameterof wheel 22 is the same as that of wheels 16 and 19. As shown, the smalldrive-gear 15 meshes with the large wheel 19, the large driven-gear 16with the small gear-wheel 21, and the large wheel 22 with the smallwheel 20. The arrangement of the gearing, as illustrated, is designed.to reduce the speed of the rotary flexible shall to about one-eighth ofthat of the motorshaft.

. By means of the rotatable gear casing in which the gears 19, 20, 21and 22 are mounted loosely, these gears are capable of a lanetarymovement around the driving s aft of the holder so as' to carry withthenfthe rotatable gear casing. When these intermediate gears are givensuch movement from the driving shaft, the driven shaft and its holderwill be permitted to remain stationary. To prevent the rotation of thegear casing normally so that a direct driving action is given throughthe differential gears to the holder shaft, a band brake 23 having anadjustable resistance is arranged in frictional contact with the gearcasing. This band 23 is located on the outside of the casing and extendspartly around it and has one end fixedly secured to the housing by a rod.24 extending across the housing and located in openings formed therein.The other end of the band is adjustably secured to the housing, or torojections 25 thereof. To tighten and oosen the belt .on the ear-easing,I preferably employ threaded bolt 26 and nut 27. The tension of the bandis regulated by means of the adjusting-nut and the band may be adjustedrelatively to the gear-casing in such a manner as to ermit the saidcasing to revolve when a pre etermined resistance or pressure isencountered b r the holder containing. the threaded part that is beingdriven into the desired position. When the resistance to the holderabove mentioned is met with the power of the driving shaft will beexerted to drive the gears of the gear casing in a planetary movementaround the holder shaft and the resistance of the band brake beingovercome, the gear-casing will be actuated by the gearing instead of theflexible rotary shaft and said casing revolved and the rotary movementof the flexible shaft and its holder transferred to the planetarymovement of the gear casing and the flexible shaft in its holder thusfreed from the driving action of the motor.

What I claim is:

1. 'An apparatus for turning a threaded part comprising a holder for thepart to be turned, a driven shaft therefor, aseparate driving shaft, aseparate rotary member, gearing engaging said driving and drivenshaftsand said rotary member, means whereby the driving action of thedriving shaft is automatically shifted from the holder to the rotarymember when the holder encounters a predetermined resistance,substantially as described.

2. An apparatus for turning a threaded part comprising a holder for thepart to be turned, a driven shaft carrying the same, a separate drivingshaft, gears intermediate said shafts, a rotary member to which thedriving action of the second shaft is automatically transferred when theholder meets -a predetermined resistance and a resistance membernormally tending to kee said rotary member from actuation by t 0 drivingshaft, substantially as described.

3. An apparatus for turning a threaded part comprising a holder for thearticle to be turned, a driven shaft carrying said holder,

maesa intermediate loose gears joining the shaft gears, a rotatable bodyin which said intermediate gears are'mounted, and a brake for saidrotatable body to hold the same normally from rotation, saidintermediate gears adapted to be positively connected to said rotatablebody and to drive the same when the resistance of the brake is overcomesubstantially as described.

4. An apparatus for turning a threaded part having means forautomatically stopping the rotary movement of the part when apredetermined resistance is encountered comprising a gearing, arotatable gear-casing, and a band-brake adjusted to automatically permitthe gear casing to revolve when the resistance offered the threaded partexceeds the resistance of the brake on the gear casing, substantially asdescribed.

5. An apparatus for turning a threaded art, comprising a holder for thearticle to be turned, a driven shaft carrying said holder, a separatedriving shaft, gears on the shafts, intermediate gears capable of aplanet? any movement with respect to the driven shaft gear, andresistance means for normally preventing the said planetary movement,said resistance means ada ted to be automatically overcome when t eholder meets a predetermined resistance in turning the threaded part,substantially as described.

6. An apparatus for turning a threaded part comprising a holder for thepart tobe turned, a driven shaft therefor, a separate driving shaft,gears on said shafts, a set of intermediate gears between and connectingsaid shaft gears, a rotatable gear casing on which the intermediategears are loosely iounted, a brake band adapted to engage the gearcasing to prevent its rotation and to hold the intermediate gears inconnecting ed to be automatically overcome in resistance bytheresistance met by the holder, whereby the gear casing Wlll be rotatedsubstantially as described.

- In testimony whereof I affix my signature in presence of twowitnesses.

GEORGE X. VVITTMER.

l/Vitnesses EDWIN L; ALLEN,

W. G. DOOLITTLE.

a separate driving shaft, gears on the shafts,

around the driven shaft by the driving shaft, I

engagement with the shaft gears and adapt-

